package 二叉树;

public class TreeNode {
    public int val;
    public TreeNode left;
    public TreeNode right;
    public TreeNode(int val){
        this.val=val;
    }
    public TreeNode(TreeNode left,int val,TreeNode right){//实参传递
        this.left=left;
        this.val=val;
        this.right=right;
    }
    @Override
    public String toString(){
        return String.valueOf(this.val);//打印
    }
}
